package com.Filter;

import java.io.File;
import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class LoginFilter implements Filter{

	@Override
	public void destroy() {
		
	}

	@Override
	public void doFilter(ServletRequest arg0, ServletResponse arg1,
			FilterChain arg2) throws IOException, ServletException {
		HttpServletRequest request = (HttpServletRequest) arg0;
		HttpServletResponse response = (HttpServletResponse) arg1;
		response.setContentType("text/html;charset=utf-8");
		String requestPaht = request.getServletPath();
		System.out.println(requestPaht);
		if(requestPaht.indexOf("/view")!=-1){
			if(request.getSession().getAttribute("user")==null){
				response.getWriter().print("<script>alert('请登录后操作！');location.href='/ExamOnline/index.html'</script>");
			}else{
				arg2.doFilter(request, response);
			}
		}else{
			arg2.doFilter(request, response);
		}
	}

	@Override
	public void init(FilterConfig arg0) throws ServletException {
		
	}

}
